The following flaw was found in Jenkins:
API tokens of other users were exposed to admins by default. On instances that don't implicitly grant RunScripts permission to admins, this allowed admins to run scripts with another user's credentials.
In very specific circumstances, it allows admins to gain permissions they would not otherwise have.
External References:
https://wiki.jenkins-ci.org/display/SECURITY/Jenkins+Security+Advisory+2015-11-11